Malicious PDF — malware analysis report

Static analysis result for SHA-256 692fca69ea6e6d1a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 11:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f0c2614e443f3fa7af8e8c83965443dd SHA-1: 04a6c8df40d18c77cb3453c92b6c9541e24c3322 SHA-256: 692fca69ea6e6d1a5b08a35b24be97278682b4de89acb434500b80d430539c79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The file's structure and URL patterns are consistent with a link farm used for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://techson-cctv.com/upload/file/nazub.pdf In PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/vokozobijamuvuxoletux.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/30953080889.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/36489755783.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e1f40499---nuwozuvovakupomerenof.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/14366908438.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd95750d31---laxenuxedokiludef.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/xapebu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f8686de9---botolazavilamejeze.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/xuzuro.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a848f3a4adb---84689849055.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dcra1lnua3p0rnldadq9tvc466/fixufenumarubazarogu.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/92014575375.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160769854b937a---15720055182.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6baeb37e4---negete.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/patigowenuvabarimotez.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9d5c544f---rilimowexavugatufaputa.pdfIn PDF document text
    • http://adveotec.com/img/file/10373764016.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/802f20cee9828497646838af8ec22e55/dobezevesutakenow.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd004e48eb---91648832907.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/forowobamolomewijexi.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4c43888142b0199356557a4e21e2f432/robubokiwujubigek.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624934729.pdfIn PDF document text
    • https://airshow-bg.com/file/90354634087.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b239d6b1975---26740001106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ant+and+dec+showsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10296 bytes
SHA-256: e1fafabb36327c7d191836458ece30f24e21f2ab4d02ec0198047a8f2a2e7865
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 17816 bytes
SHA-256: e8e0cab035d76730c902ba7ba2d1ae7ce26aa559613ba56f5536ecff4daa7daf
font_02_sfnt_off00013945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1